Скачать или смотреть Brayton Cycle Problem Solved | Cengel Thermodynamics 9th | Power Output, Mass Flow Rate, Efficiency

Problem 9-92 Air is used as the working fluid in a simple ideal Brayton cycle that has a pressure ratio of 12, a compressor inlet temperature of 300 K, and a turbine inlet temperature of 1000 K. Determine the required mass flow rate of air for a net power output of 70 MW, assuming both the compressor and the turbine have an isentropic efficiency of (a) 100 percent and (b) 85 percent. Assume constant specific heats at room temperature. Answers: (a) 352 kg/s, (b)1037 kg/s

🎓 Welcome to Education Shop, your trusted source for solving tough thermodynamics problems from Cengel’s Thermodynamics: An Engineering Approach (9th Edition).

In this lecture, we solve Problem 9-92, a detailed Brayton cycle analysis with a focus on isentropic efficiencies and mass flow rate calculations.

✅ Problem Overview:

Pressure ratio: 12

Compressor inlet temperature: 300 K

Turbine inlet temperature: 1000 K

Desired net power output: 70 MW

Working fluid: Air

Assumption: Constant specific heats at room temperature

📌 What You Will Learn:
🔹 Mass flow rate of air required for net power output
🔹 Effect of isentropic efficiency on performance
🔹 Brayton cycle fundamentals and equations

📊 Final Answers:

(a) 100% efficiency → 352 kg/s

(b) 85% efficiency → 1037 kg/s

This problem is essential for students studying gas turbines, air-standard cycles, and power plant engineering. Perfect for mechanical engineering, GATE, FE/EIT, and university exams.